40 lines
1.1 KiB
ArmAsm
40 lines
1.1 KiB
ArmAsm
|
/*
|
||
|
|
* sim-read.S -- read interface for FT32 simulator
|
||
|
|
*
|
||
|
|
* Copyright (C) 2015 FTDI (support@ftdichip.com)
|
||
|
|
*
|
||
|
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
||
|
|
* and license this software and its documentation for any purpose, provided
|
||
|
|
* that existing copyright notices are retained in all copies and that this
|
||
|
|
* notice is included verbatim in any distributions. No written agreement,
|
||
|
|
* license, or royalty fee is required for any of the authorized uses.
|
||
|
|
* Modifications to this software may be copyrighted by their authors
|
||
|
|
* and need not follow the licensing terms described here, provided that
|
||
|
|
* the new terms are clearly indicated on the first page of each file where
|
||
|
|
* they apply.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "syscall.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Input:
|
||
|
|
* $r0 -- File descriptor.
|
||
|
|
* $r1 -- Buffer to be read into.
|
||
|
|
* -0x12($fp) -- Length of the buffer.
|
||
|
|
*
|
||
|
|
* Output:
|
||
|
|
* $r0 -- Length read or -1.
|
||
|
|
* errno -- Set if an error
|
||
|
|
*/
|
||
|
|
|
||
|
|
.globl _read
|
||
|
|
.type _read,@function
|
||
|
|
.weak read
|
||
|
|
.text
|
||
|
|
_read:
|
||
|
|
read:
|
||
|
|
# swi SYS_read
|
||
|
|
return
|
||
|
|
.Lend:
|
||
|
|
.size _read,.Lend-_read
|